Information recording medium
US5147701A · kind A · utility
13Cited by
3References
11Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Dec 28, 1989 |
| Grant date | Sep 15, 1992 |
| Priority date | — |
| Expiry date | Dec 28, 2009 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/24942
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
In an optical information recording medium, a protective layer containing a material not reacting with an active layer is disposed, and the composition ratio of this protective layer is designed so as to increase the amount of the material not reacting with the active layer near the border contacting with the active layer, so that degradation of the active layer is prevented. In this construction, the stability is maintained after repetition of recording and erasing cycles over 1 million times.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.